Door-check



(1I0 Model.) 2 Sheets8heet 1. H. I. BLUNT.

11003 CHECK. No. 435,678. Pa.tented Sepia. 2, 1890.

(No Model) 2 Sheets-Sheet 2. E. I. BLOUNT. DOOR CHECK. N0. 435,678.Patented Sept. 2, 1890.

UNITED STATES PATENT OFFICE.

EUGENE I. BLOUNT, OF OAMBRIDGE, MASSAOHUSETTS, ASSIGNOR TO THE BLOUNTMANUFACTURING COMPANY, OF MAINE.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No.

Applicatiou filed April 19, 1890.

435,678, dated September 2, 1890.

Serial Na. 348,606. (No model.)

T0 all whom it ma y concern:

Be it known thatl, EUGENE I. BLOUNT, of (Jambridge, in the county ofMicldlesex and State ofMassaehusetts, have inventecl eertain new anduseful Impr0ve1nents in Door Oheeks, of Wl1i0h the following is 21specificati0n.

My invention relates t0 cl0orel1eeks of the kind or elass in whichliquid is employed as an element t0 resist the free action of thedoor-closing spring.

It is tl1e object of my invention t0 provicle sueh improvements indoor-checks of the kind mentionecl as Will more certainly p1oteet tl1eliquicl-chamber against leakage tl1an heretof0re.

It is also the object of my inventi0n t0 provide mproved 1neans f0rregulating 0he valves an l liquiclporis in the operation of thedoor-check.

T0 these ends 1ny inventi0n consists in providing ohe cap screwed uponthe outer end of the liquiclchamber with an offset on its in- 11e1 uppere(lge, plaoing paeking in the saicl offset, ancl arranging a ring uponthe cylinler above tl1e cap, so that it may be screwed clown upon thesaid packing, thereby rendering the conneetion between the eap ancl tl1eeylincler thorouglfly liquiltight.

My invention als0 consists in enlarging 01 chambering the upper p01ti0nof the neek 01 hearing eonnectecl with 01 0rmecl in the partition of thecylincler di"iding the liquid an l spring eharnbers, and througl1 whichthe 0scillatory shaft passes, placing paeking in the said ehzunberaround the saicl shaft, and providng a nut hzwing its lower faseinelinecl inwarclly, which nut is adaptecl to be screwecl down aroundthe oseillatory shaft upon the saicl paeking, so as to make itimpossible f01 liquid in the lquid-ehzunber to leak between theoseillatory shaft and its hearing.

My invention also eonsists in providing tl1e partition in the liquid-eupWith a duplex valve eontrolling he ports th1011gl1 wl1ich tl1e liquidflows in the aet of elosng the door.

My invention als0 consists in the constructi0n :1ncl relationship ofparts and features in door-checks, whereby the same are rendered moreeflieient thzm heretofore.

l\iy invention will fi1st be described in 0011 neetion with theaecompanying drawings, and the letters of referenee marked tl1ereon,forrning 21 part of this speeifieation,and tl1en be pointed out in theappendecl claims.

In the drawings, Figu re 1 is 21 top plan view of my improved door-checkattacl1ed to a door and door-easing. Fig. 2 is a perspectix*e "iew ofalle cylinder and a part of its equipments in verted, tl1e cup 011 theend of the liquid-ehamber being rexnovecl. Fig. 3 is a-top plan view ofthe wing 01 piston eonneeted with the os cillat-ory shaft at 1gh' anglestl1ereto ancl adapted t0 operate in the liquid-chamber. Fig. 4: is avertical eentral se0t-ional vierv of the cylincler and its equipments.Fig. 5 is aview of one side, and Fig. 0 of the opposite sicle, of thepartition in the liquid-chamber.

lhe same letters designate the sa1ne parts 0r features, as the case maybe, in all of the views.

In the drawngs, a designates tl1e cylinder dividecl by the partitionbinto aliquid-cham bei 0 and a spring-chamber d, into or through Wl1icheylincler tl1ere extends an oseillatory shaft e, aclapced to be actuatedby the spring f, t0 close the door through the medium of arms 01 1eversconneeting tl1e sai l shaft wibh the door, as will be understood bytl1ose skillecl in the art 11p011 2111 inspeetion of Fig. 1 of tl1edrawings. As is herein shown, tl1e eylincler a is vertieally arrangedWith the springchamber uppermost, thongl1 a reversed 01 otherarrangement may be made of the cylinder, as eireumstances may suggest 01require.

Affixed in the liqu lehan1ber 0 is a parti ti0n g, extending from theside and top and bottom of the ehan1ber to the oseillatory sl1aft e,ancl conneeted with the said. sl1aft ancl ex tending at rigl1t anglestl1ereto is a Wing 0r pistn 71, aclaptecl, as the sl1aft is oscillated,L0 be moxecl in the chamber f10n1 one side of: the partition to theother. Valves and ports are proviclecl in the saicl partition ancl wingorpiston, so that the liquid in the cha1nber will flow With eomparativefreedozn from one side of the partition 2111d wing to the other when thedoor is being opened, bui; offer quite considerable resistanee to themovement of IOO the Wing 01 piston by the spring f in closing the door.This pressure of the wing up0n the liquid renders it necessary to makethe chamber c quite liquid-proof. T0 attain the last-mentioned end atthe point between the cap i, screwed upon the lower end of the cylinderand the cylinder-body,-I offset the upper inner face of the cap 2, as atj, and provide an annular packing-strip 7a, adapted to fit in saidofiset, and, it may be, to extend above the upper edge of the cap, ztndconstruct and arrange a ring Zabove the packing, so that it mzty besorewed down thereon with great force by means of a spanner operating onthe ribs or projections m, 01 by other suitable means. The neck erhearing n for the osoillatory shatt e, oonnected with the partitions b,I enlarge or ohzunber in its upper part, into whioh and around the saidshaft is tapped a nut 0, the lower faee of whieh is inclined inwardlyand upward, so as that it may act upon a packingp in the lower part ofthe chamber around the shaft to form & liquid-tight conneotion at chatpoint. The upper end of the nut 0 is sq1ared or otherwise construoted toenable it to be engaged by a wrench or other means, and be turnedthereby. The Wing his provided with a valve q, adapted to operate over aport formed in the said ring, allowing the liquid in the chamber 0 toflow freely through said port as the wing moves in the direction of thearrow in Fig. 2, and the door is being opened, but closing said port asthe wing moves in the oppositedrection in the eet of olosing thedoer.

Ports r s are formed in the partition g, the extent to which theformeris opened or closed being controlled by a valve t, adapted to bemoved in one direotion by a spring u and in the opposite direction by ascrew o, tapped into the cylnder and operating against the valve or apin 01 projeotion thereon, though it is obvious that the screw might bemade to engage the said valve and move it in both direetions, and theextent to which port 3 is opened being controlled by the valve 10,operated upon by a temperature-spring 00, as is described and claimed inmy application for a patent Serial N o. 305,674, filed April 2, 1889. Itwill thus be seen that the partition gis provided with a duplex valve,one being automatically operated by the temperature of the liquid andthe other controlled mechanioally through the medium of the thurnb-screwv. As the spring f operates to close the door and to move the wing orpiston h in a direction opposite to that indicated by the arrow in Fig.2, the port in the s2tid win 9; will be closed by the valve q, asstatecl, so that the escape of the liquid from one side of the partitiong to the other will be through the comparatively small ports 7 8, andconsequently the lqnid Will flow through said prts slowly, and theresistance of the liquid to the action of the spring will beoomparatively great. By this means a slow closing of the door withoutslam or jar is effeeted. By means of the mechanicztlly-operated valve 25the port or port-s inthe partition g may be adjusted to snitcircumstances,while the Vah're wis operated automatically in accordeuncewith the temperature and consequent consistency of the liquid in theliquid-chamber.

In order to effect a partial olosing of the door with a comparativelyquick motion I cut away a portion of the hubof the wing g, as at 1 for apart of the distance ztround said hub so that when the door is fullyopened an apertnre 01 port will be formed at the cutaway point y,between the hub and adjacent edge of the partition g, through whiohportg the liquid nmy freely flow fro1n one side of the partition to theother until the door approaches a closed positionwhen thecut-awzty pointy Will hawe passed the partition and the hub Will operette in quiteclose proximity to the partition, so that the only escape of liquid Willbe through the ports r s, While the door is being lorought to fullyclosed position. The upper end of the wing-hub on the side opposite tothat at whioh the said hub is cut away, as at 3 is provided with agroove z, sothat any liquid that might leek or be squeezed throughbetween the upper face of the hub and the part with whioh it moves incontact 1nty not be forced up into the spring-ohamber d, but run outthrough the sgtid groove z.

It is obvous that changes may be made in the form and arrangement ofparts comprising my invention without departing from the nature orspirit thereof.

I do not herein clain1the subject-matter of rny pending application forpatent filed April 2, 1889, Serial N o. 305,674, Which oomprises adoor-check embracing in its construction a eylnder adapted to holdsuitable liquid, an oscillatory shaft in said cylinder, a par*ition inthe said cylinder extending parallel with said shaft, a wing 01 pistonattaohed at right angles to the said shaft to operate on the liquid, anda suitable port to permit the flow of liquid as the shaft is oscillated.

Having thus explainecl the nature of my in vention and described 2l wayof making and using the same, I declare chat what Iclairn is 1. Thecombination, with the oylinder a, of the screwcap a ring Z, having aserewthreaded connection with the cylinder, and an interposed paoking,as set forth.

2. The combination, with the oylinder a, of the screw-cap 11, ofset, asatj, string l, having a screw-thread connection with the cylinder, and apacking 7e, arranged in the offset of the cap aud. interposed betweenthe same and the ring Z, as set forth.

3. The combination, with the oylinder a, and the oscillatory shaft etherein, of the partition Z), provided with the chambered bearing forthe said shaft, the nut 0, tapped in said ehzunber and having its lowerface 01 end upwardly and inwardly inclined, and the paekng p, as setforth.

4. A door-check embracing in its construc tion a cylinder adapted toheld suitable liquid,

